An ultra-stable custom current supply for use in a neutron electric dipole moment experiment

This article focuses on the design, construction, and characterization of an ultra-stable current source. Prototypes of the sub-modules have been constructed and subjected to comprehensive characterization. The experimental results are systematically compared with simulations of the current supply. Real-world testing showcases enhanced precision when compared to existing supplies. The intended application of this current source is to attain an exceptionally stable (< pT) and uniform (< nT/m) magnetic field within the measurement cell. Additionally, its versatility extends to various precision experiments or measurements with practical applications across industries such as telecommunications, medical devices, medical imaging, diagnostics, physics, and materials science. In each of these fields, the stable current source plays a crucial role in ensuring accuracy and reliability for specific applications and experiments. The finalization of the current source PCB, along with the integration of an enclosure, is currently in progress.